| Ccci Ltd | Other services | 2013 |
| CCT Global Holdings Ltd | Financial services | 2025 |
| CCT Global Investments Ltd | Financial services | 2025 |
| CCT Global Solutions Ltd | Professional & scientific | 2025 |
| CDI Homes Limited | Construction | 2017 |
| Cecil Court (Southsea) Management Limited | Households | 1977 |
| Cedar Court Southsea Limited | Households | 2020 |
| Cedars Restaurant Ltd | Hospitality | 2018 |
| Ceendesis Ltd | Information & communication | 2026 |
| Celebrate NOW Events Ltd | Hospitality | 2023 |
| Centre for Languages Ltd | Education | 2024 |
| CF Southern Legion Limited | Arts & recreation | 2013 |
| CFL Paving Groundworks Limited | Construction | 2019 |
| Chaiiwala Southsea Limited | Hospitality | 2025 |
| Channel View Estates Limited | Real estate | 2017 |
| Chappers Telco Limited | Information & communication | 2016 |
| Charcoal Grill Albert Ltd | Hospitality | 2018 |
| Charcoal Kebabs Ltd | Hospitality | 2026 |
| Chardan Printing Ltd | Manufacturing | 2025 |
| Charlotte Cornelius Ltd | Wholesale & retail | 2013 |
| Charntec Electronics Limited | Wholesale & retail | 1979 |
| Charterhouse Underwriting Limited | Financial services | 1996 |
| Chatter Splatter Nursery - Liss Limited | Education | 2022 |
| Chaulk Ltd | Education | 2018 |
| Cheap Print Limited | Professional & scientific | 2016 |
| Chest Enterprises Limited | Extraterritorial | 2022 |
| Chestplate Limited | Wholesale & retail | 2024 |
| Chevremont Holdings Limited | Real estate | 2024 |
| Chichester City 3G Ltd | Arts & recreation | 2024 |
| Chichester Community Football Club Management Ltd | Arts & recreation | 2018 |
| Chichester Doodles Limited | Agriculture & fishing | 2021 |
| Chichester Flooring Ltd | Construction | 2025 |
| Chichester Land Ltd | Real estate | 2023 |
| Chief Beef Ltd | Hospitality | 2023 |
| Chillibyte Limited | Information & communication | 2005 |
| Chimms Healthcare Limited | Health & social care | 2014 |
| Chocolate Milk Apparel Ltd | Wholesale & retail | 2025 |
| Chris Tonkin Ltd | Real estate | 2022 |
| Chris Watson Properties Ltd | Real estate | 2020 |
| Chris Wreford Consulting Ltd. | Professional & scientific | 2011 |
| Christ Central Church Ltd | Other services | 2006 |
| Chronicles Reporters News Ltd | Information & communication | 2026 |
| Chronos Consulting & Training Limited | Professional & scientific | 2010 |
| Churchill Court Management Limited | Professional & scientific | 1974 |
| Cintec Integrated Systems Ltd | Construction | 2024 |
| Circle Back Limited | Information & communication | 2024 |
| City Gym Ltd | Arts & recreation | 2020 |
| City Lounge Barbers Limited | Other services | 2025 |
| City of Vape Ltd | Wholesale & retail | 2024 |
| City Veterans CIC | Health & social care | 2020 |
| Cityport Kitchen Ltd | Hospitality | 2026 |
| CJC Financial Ltd | Financial services | 2019 |
| CJL Young Limited | Real estate | 2025 |
| CJR Fire Protection Ltd | Construction | 2024 |
| Claire's Deli Ltd | Hospitality | 2024 |
| Clardent Limited | Health & social care | 2007 |
| Clarence Parade Park House Residents Association Limited | Administrative & support | 1979 |
| Clarendon Care Home Ltd | Real estate | 2002 |
| Clarendon Care Limited | Health & social care | 2022 |
| Clarendon Homes (Management) Limited | Professional & scientific | 2012 |
| Clarendon House Freehold Limited | Households | 2022 |
| Clarendon House RTM Company Limited | Households | 2022 |
| Clarendon Road Laundrycare Limited | Other services | 1996 |
| Clarendum Consulting Ltd | Professional & scientific | 2026 |
| Clean Diesel Company Limited | Administrative & support | 2021 |
| Clean Sparkling Solution Ltd | Extraterritorial | 2024 |
| Cleans With Sunshine Ltd | Administrative & support | 2021 |
| Clear Ledger Business Support Limited | Professional & scientific | 2026 |
| Clearwater Lettings (Southsea) Limited | Real estate | 2022 |
| Clinical Transparency Limited | Health & social care | 2012 |
| Clock & Watch Centre Limited | Wholesale & retail | 2025 |
| Cloud Portsmouth Limited | Professional & scientific | 2015 |
| CLOUD9 Foot Clinic Ltd | Health & social care | 2025 |
| Cloudy Base UK Ltd | Wholesale & retail | 2023 |
| Club Cubedo Ltd | Wholesale & retail | 2025 |
| CM Brickwork Ltd | Construction | 2026 |
| Cmastersfilm Ltd | Information & communication | 2026 |
| Cmhireforce Ltd | Construction | 2022 |
| CMT Sales Ltd | Wholesale & retail | 2025 |
| CNP Automotive Limited | Wholesale & retail | 2025 |
| Co.Solar Ltd | Administrative & support | 2026 |
| Coachfolashade Ltd | Professional & scientific | 2025 |
| Coak Ltd | Information & communication | 2024 |
| Coast Roofing Services Limited | Construction | 2024 |
| Coastal Services Repairs Limited | Manufacturing | 2017 |
| Coastal Spectrum Limited | Real estate | 2023 |
| Coastline Property Holdings Ltd | Real estate | 2023 |
| Cobalt Consultants Ltd | Professional & scientific | 2015 |
| Cobb Taverns Limited | Hospitality | 2022 |
| Cobnor Catering Ltd | Hospitality | 2026 |
| Cockleshell Community Sports Club Limited | Arts & recreation | 2010 |
| Coconuts (Delivering Paradise) Limited | Transport & logistics | 2024 |
| Cocos Group Ltd | Hospitality | 2019 |
| Coex Solutions Limited | Information & communication | 2021 |
| Colburn Ltd | Manufacturing | 2018 |
| Collaborative Enterprises Ltd | Other services | 2017 |
| Collingwood Technology Ltd | Professional & scientific | 2025 |
| Coltraco Limited | Manufacturing | 1994 |
| Comitas Limited | Information & communication | 2025 |
| Commercial GAS Engineers Southern Ltd | Construction | 2022 |